I found this picture which was on Torchwood Forum posted by gorlagon.
Donna reminds me of a bit of a Sarah Jane here. she looks way more calmer and smarter. Like maybe she's gone to a few anger management classes since she last met the Doctor, and no longer feeds the need to keep bellowing. Though she did make me laugh when she was like that.
More little bits of Doctor Who news:
* In the first episode of season four, Donna tracks the Doctor down "during an alien emergency in modern-day London".
* As teased at the end of "Last of the Time Lords", the Doctor and Donna will be meeting Agatha Christie.
* Christie will be played by Fenella Woolgar, who was recently one of the lesbian detectives in Jekyll. You know, the one who wasn't her off Goodness Gracious Me.
* This episode will also feature Felicity Kendall as Lady Clemency Eddison.
* Tim McInnerny (Percy in Black Adder) will be in another episode, later in the series. We'd like to see him as a chinless UNIT officer who says "righto, Doctor!" a lot. But that's just our fantasy.